Treatment tool for endoscope

Abstract

A treatment tool for an endoscope includes a transmitting part that transmits an operation of the operating part to a grip part of a distal end part and a bendable part. The operating part has an operating member that is rotatable and translatable. The transmitting part has a first member to which rotation and translation of the operating member are transmitted and a second member to which only the rotation of the operating member is transmitted. The grip part is closed by the translation of the first member, and the bendable part is bent by the rotation of the second member.

What is claimed is: 
     
       1. A treatment tool for an endoscope comprising:
 an insertion part that has a distal end part, which is provided with an openable and closable grip part, and a bendable part, which is provided adjacent to the distal end part and is bendable, and that is insertable into a body; 
 an operating part into which an operation of closing the grip part and an operation of bending the bendable part are input; and 
 a transmitting part that transmits the operations of the operating part to the grip part and the bendable part, 
 wherein the operating part has an operating member that is rotatable about a first rotation axis and is translatable along the first rotation axis, 
 the transmitting part has
 a transmitting member that extends from the operating member to the insertion part and is capable of transmitting a rotation and translation of the operating member, 
 a first member that is rotatable about a second rotation axis matching a central axis of the insertion part, is translatable along the second rotation axis, and is connected to a distal end part of the transmitting member so that the first member is provided between the transmitting member and the bendable part, and 
 a second member that is rotatable about the second rotation axis and is not translatable along the second rotation axis, 
 
 the first member has an engaging part and the second member has an engaging part, and the engaging part of the first member and the engaging part of the second member are engaged with each other, thereby allowing a translation of the first member along the second rotation axis relative to the second member and preventing a relative rotation between the first member and the second member about the second rotation axis, 
 the grip part is configured to be capable of being closed based on one of translation of the first member or a rotation of the second member, and 
 the bendable part is configured to be capable of being bent based on other of the translation of the first member or the rotation of the second member. 
 
     
     
       2. The treatment tool for an endoscope according to  claim 1 ,
 wherein each of the engaging part of the first member and the engaging part of the second member has an engaging surface that extends parallel to the second rotation axis and intersect a circumferential direction about the second rotation axis. 
 
     
     
       3. The treatment tool for an endoscope according to  claim 1 ,
 wherein the transmitting member is a coil spring. 
 
     
     
       4. The treatment tool for an endoscope according to  claim 1 ,
 wherein the bendable part has
 a tubular member that bends in one direction in an unrestrained state and is elastically deformable, and 
 a restraining member that is capable of restraining the tubular member in a linear shape, 
 
 the restraining member is bonded to the second member, and 
 in response to the rotation of the second member, the restraining member covers a bent inner diameter portion in bending of the bendable part in the one direction and restrains the bendable part in a linear shape by covering the bent inner diameter portion, or the restraining member covers a bent outer diameter portion in the bending of the bendable part in the one direction and releases restraint of the bendable part by covering the bent outer diameter portion. 
 
     
     
       5. The treatment tool for an endoscope according to  claim 4 ,
 wherein the transmitting part has a wire that connects the grip part and the first member to each other through the bendable part, and 
 in response to the translation of the first member, the wire is pulled to a side of the first member or is pushed to a side of the grip part, thereby closing the grip part. 
 
     
     
       6. The treatment tool for an endoscope according to  claim 1 ,
 wherein the bendable part has
 a tubular member that bends in one direction in an unrestrained state and is elastically deformable, and 
 a restraining member that is capable of restraining the tubular member in a linear shape, 
 
 the restraining member is bonded to the first member, and 
 in response to the translation of the first member, the restraining member covers the bendable part and restrains the bendable part in a linear shape by covering the bendable part, or the restraining member is moved to an operating part side of the bendable part at which the operating part is provided and releases restraint of the bendable part by moving to the operating part side. 
 
     
     
       7. The treatment tool for an endoscope according to  claim 6 ,
 wherein the transmitting part has a coil spring that connects the grip part and the second member to each other through the bendable part, and 
 in response to the rotation of the second member, the coil spring expands or contracts, thereby closing the grip part. 
 
     
     
       8. The treatment tool for an endoscope according to  claim 1 , wherein the second member is externally fitted or internally fitted to the first member. 
     
     
       9. The treatment tool for an endoscope according to  claim 1 , wherein the first member and the second member are not bendable.